class/core: Fix machine override detection for local source overrides
class/core: Fix machine override detection for local source overrides

(refs #125)

sknsean/core,sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,diorcety/oe-lite-core,diorcety/oe-lite-core